Extension bar



FIG. 1 is a perspective view of an extension bar, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof.

Wherein, the broken lines are shown for illustrative purposes only andform no part of the claimed design.

CLAIM The ornamental design for an extension bar, as shown anddescribed.